Abstract:
In recent years, modern technological developments in the field of telecommunications
and the use of increasingly high frequencies leading to the design of increasingly
miniaturized circuits and devices have prompted investigations for more and more efficient
technologies.
The substrate integrated waveguide technology is currently the most promising avenue
as an alternative to passive planar devices. SIWs offer the advantage of eliminating
radiation losses, and significantly reducing insertion losses, and improving the quality
factor. The production costs are low, consumer substrates such as FR4 or LTCC printed
circuit boards are suitable for the implementation of SIWs, which therefore have better
quality/price ratios.
In this thesis, the work is directed towards the proposal of new efficient techniques for
the design, optimization, realization and adjustment of microwave filters that overcome the
limitations of existing techniques. More concretely, our contributions will revolve around
two components:
In the first part, we were interested in the design of compact and high-performance SIW
wide-bandpass filters, for high-speed applications, in particular for 5G applications. Based
on the technique of multimode resonators, new SIW filters broadband have been
developed. This technique solves the size and integration problems of current filters while
maintaining equivalent electrical performance.
In the second part, to reduce the volume of communication systems, a new approach to
design a SIW filter tunable in central frequency and bandwidth with a good quality factor,
easy integration and a wide tuning range is proposed.
